CN116859351A - Frequency modulation continuous wave radar target simulator and microwave radar sensing test system - Google Patents
Frequency modulation continuous wave radar target simulator and microwave radar sensing test system Download PDFInfo
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Abstract
According to the frequency modulation continuous wave radar principle, after receiving a microwave radar signal, a circuit integrated on a circuit board of the simulator generates and returns an echo signal containing detection target information to the microwave radar, and whether the function of the radar in an actual scene can meet the use requirement is deduced by detecting the processing capacity of the radar on the echo signal. The method and the device realize quantification, adjustability and repeatability of the target signal which is difficult to quantify, inflexible and poor in repeatability in the prior art, can accurately set the distance information, the speed information and the amplitude information of the radar echo signal simulation target, and enable the microwave radar test to be more economical and flexible and better in scene repeatability and controllability.
Description
Technical Field
The invention relates to the field of microwave radars, in particular to a frequency modulation continuous wave radar target simulator and a microwave radar sensing test system.
Background
With the gradual deepening of radar technology from military to civil use, microwave radar is used as a sensor and applied to various consumer products. The microwave radar sensor can be installed in a hidden mode, is not influenced by temperature, air flow, dust, smoke and the like, has the advantages of long service life, high reaction speed, higher sensitivity, wide induction area and the like, gradually replaces the sensing technologies such as infrared, sound control and the like to be widely applied to consumer electronic products in multiple fields, comprises energy-saving illumination, security protection, intelligent household appliances and the like, and is an important link in the research and development of the microwave radar products and the production process of the microwave radar products.
For the products such as present energy-saving illumination, security protection, intelligent household appliances, etc., the microwave radar sensor test scheme, especially frequency modulation continuous wave radar, generally use angle anti-antenna, swaying ware, people walk or wave hand etc. to come as the defect of the detection target of this kind of mode of test frequency modulation continuous wave radar sensor lies in: the test results are perceptively difficult to quantify, inflexible and poorly reproducible. Particularly, in the production test, when a plurality of frequency modulation continuous wave radar sensor products are detected and tested with targets at the same time, the scheme can amplify deviation of sensing results of different frequency modulation continuous wave radar sensors, so that consistency is deteriorated, and the real performance of the frequency modulation continuous wave radar products cannot be truly tested.
Disclosure of Invention
In view of the above drawbacks of the prior art, an object of the present invention is to provide a frequency modulation continuous wave radar target simulator and a microwave radar sensing test system for solving the above technical problems in the prior art.
To achieve the above and other related objects, the present invention provides a frequency modulated continuous wave radar target simulator for simulating a detected target distance, a target speed, and a target amplitude of a detected target, the target simulator comprising: the signal receiving module, the low noise amplifier, the first attenuator, the signal conversion and phase shift module, the first mixer, the second mixer, the processing module, the frequency synthesizer, the combiner, the second attenuator, the power amplifier and the signal transmitting module are integrated on the circuit board of the simulator; the signal receiving module, the low noise amplifier, the first attenuator and the signal conversion and phase shift module are sequentially connected in series; the first mixer and the second mixer are respectively connected with the signal conversion and phase shift module, the frequency synthesizer and the combiner; the processing module is connected with the frequency synthesizer; the combiner, the second attenuator, the power amplifier and the signal transmitting module are sequentially connected in series; the signal receiving module receives an electromagnetic wave signal sent by the frequency modulation continuous wave radar sensor, and then the signal receiving module sequentially amplifies the electromagnetic wave signal and adjusts the amplitude of the electromagnetic wave through the low noise amplifier and the first attenuator; the signal conversion and phase shift module converts the regulated signal from a single-ended signal to a differential signal and outputs a pair of orthogonal radio frequency signals; converting, by the frequency synthesizer, a digital signal conforming to an analog target feature generated by the processing module based on an analog target parameter associated with the detection target into a pair of baseband analog quadrature signals conforming to the analog target feature; the first mixer and the second mixer respectively mix the baseband analog quadrature signal with the quadrature radio frequency signal output by the signal conversion and phase shift module, and then add the signals mixed by the first mixer and the second mixer through the combiner; the added signals sequentially pass through a second attenuator and a power amplifier to amplify the signals and adjust the amplitude of electromagnetic waves, and the signal transmitting module returns the analog target signals which accord with the detection target distance, the target speed and the target amplitude of the detection target to the frequency modulation continuous wave radar sensor.
In an embodiment of the present invention, a method for simulating a detected object distance of a detected object includes: changing frequency parameters of a frequency synthesizer according to a received digital signal generated by the frequency synthesizer based on analog target parameters related to the detection target distance of a detection target through the processing module, converting the digital signal into a baseband analog orthogonal signal pair conforming to the target frequency, respectively mixing the baseband analog orthogonal signal pair with the orthogonal radio frequency signals output by the signal conversion and phase shift module through the first mixer and the second mixer, and adding the mixed signals of the first mixer and the second mixer through the combiner so as to enable the added signals to sequentially pass through a second attenuator, a power amplifier to be amplified and an electromagnetic wave amplitude adjustment to generate analog target signals conforming to the detection target distance; the frequency parameter is used for obtaining the corresponding detection target distance by the frequency modulation continuous wave radar sensor based on the intermediate frequency beat signal frequency of the analog target signal.
In an embodiment of the present invention, the method for simulating the target speed of the detected target includes: changing phase parameters of a frequency synthesizer according to a received digital signal generated by the frequency synthesizer based on an analog target parameter related to a target speed of a detection target through the processing module, converting the digital signal into a baseband analog quadrature signal pair conforming to a target phase, respectively mixing the baseband analog quadrature signal pair with a radio frequency signal output by the signal conversion and phase shift module through the first mixer and the second mixer, adding the mixed signals of the first mixer and the second mixer through the combiner, and sequentially carrying out signal amplification and electromagnetic wave amplitude adjustment on the added signals through the second attenuator and the power amplifier to generate an analog target signal conforming to the target speed; and the phase of the intermediate frequency beat signal frequency of the analog target signal is related to the phase parameter, so that the frequency modulation continuous wave radar sensor can obtain the target speed through the phase difference between the received intermediate frequency beat signal frequencies of the analog target signal in adjacent frequency modulation periods.
In an embodiment of the present invention, the method for simulating the target amplitude of the detection target includes: and adjusting the amplitude of the signal by setting one or more of parameters of a low noise amplifier, a first attenuator, a second attenuator, a frequency synthesizer and a power amplifier, and generating an analog target signal of the output power which accords with the target amplitude.
In an embodiment of the present invention, the signal receiving module includes: a circular polarization receiving antenna, a first radio frequency switch and a receiving radio frequency head are arranged in the antenna; the built-in circularly polarized receiving antenna is used for receiving electromagnetic wave signals in any polarization direction; the receiving radio frequency head is used for externally connecting a receiving antenna so as to receive electromagnetic wave signals through the receiving antenna; the radio frequency switch is connected with the built-in circularly polarized antenna and the receiving radio frequency head and is used for controlling the built-in circularly polarized antenna or a receiving antenna externally connected with the receiving radio frequency head to correspondingly receive electromagnetic wave signals so as to input the electromagnetic wave signals to the low noise amplifier.
In an embodiment of the present invention, the signal transmitting module includes: a circular polarization transmitting antenna, a second radio frequency switch and a transmitting radio frequency head are arranged in the antenna; the built-in circularly polarized transmitting antenna is used for transmitting a simulated target signal in the form of circularly polarized electromagnetic waves; the transmitting radio frequency head is used for being externally connected with a transmitting antenna so as to transmit the analog target signal through the transmitting antenna; the radio frequency switch is connected with the built-in circular polarization transmitting antenna and the transmitting radio frequency head and is used for controlling the transmitting antenna externally connected with the built-in circular polarization transmitting antenna or the transmitting radio frequency head to transmit the simulation target signal.
In an embodiment of the present invention, the built-in circular polarized receiving antenna and the built-in circular polarized transmitting antenna are respectively embedded in the front surface of the simulator circuit board, and the back surface of the simulator circuit board is respectively provided with a feed network which is matched with the built-in circular polarized receiving antenna and the built-in circular polarized transmitting antenna; the built-in circular polarization receiving antenna and the built-in circular polarization transmitting antenna are respectively provided with a first feeding point and a second feeding point, and the first feeding point and the second feeding point connect the antennas with the corresponding feeding network in a metal via way; the first feeding point and the second feeding point are equal in distance from the geometric center of the corresponding antenna, and connecting lines of the two feeding points to the geometric center of the corresponding antenna are orthogonal to each other; the built-in circularly polarized receiving antenna is combined with a corresponding feed network to receive electromagnetic wave signals sent by the frequency modulation continuous wave radar sensor; and the built-in circularly polarized transmitting antenna is combined with a corresponding feed network to send the generated simulated target signal in the form of transmitting circularly polarized electromagnetic waves to the frequency modulation continuous wave radar sensor.
In an embodiment of the present invention, the signal conversion and phase shift module includes: a signal conversion section for converting the adjusted signal from a single-ended signal to a differential signal; and the phase shifting component is connected with the signal conversion component and is used for shifting the phase of the converted differential signal and outputting a pair of orthogonal radio frequency signals.
In an embodiment of the invention, the processing module is configured to set the simulation target parameter based on a control instruction of a control end of an upper computer connected to the fm continuous wave radar target simulator, and generate a digital signal according with a characteristic of the simulation target.
To achieve the above and other related objects, the present invention provides a microwave radar sensing test system, comprising: the frequency modulation continuous wave radar sensor is arranged on a tool plane of the fixed tool; the frequency modulation continuous wave radar target simulator is arranged in the normal direction along the tool plane; the frequency modulation continuous wave radar target simulator simulates the detection target distance, the target speed and the target amplitude of the detection target based on the received electromagnetic waves transmitted by the frequency modulation continuous wave radar sensor and the simulation target parameters related to the detection target, and returns each simulation target signal conforming to the detection target distance, the target speed and the target amplitude of the detection target to the corresponding frequency modulation continuous wave radar sensor so that the frequency modulation continuous wave radar can obtain the detection target distance, the target speed and the target amplitude of the detection target based on the received simulation target signals.
As described above, the invention relates to a frequency modulation continuous wave radar target simulator and a microwave radar sensing test system, which have the following beneficial effects: according to the principle of the frequency modulation continuous wave radar, after receiving a microwave radar signal, a circuit integrated on a circuit board of the simulator generates and returns an echo signal containing detection target information to the microwave radar, and whether the function of the radar in an actual scene can meet the use requirement is deduced by detecting the processing capacity of the radar on the echo signal. The method and the device realize quantification, adjustability and repeatability of the target signal which is difficult to quantify, inflexible and poor in repeatability in the prior art, can accurately set the distance information, the speed information and the amplitude information of the radar echo signal simulation target, and enable the microwave radar test to be more economical and flexible and better in scene repeatability and controllability.
Drawings
Fig. 1 is a schematic diagram showing a relationship between a transmission frequency and time of a fm continuous wave radar according to an embodiment of the invention.
Fig. 2 is a schematic diagram of a fm continuous wave radar target simulator according to an embodiment of the invention.
Fig. 3 is a schematic diagram showing a relationship between a sending signal and a receiving signal of the fm continuous wave radar according to an embodiment of the invention.
Fig. 4 is a schematic diagram showing the relationship between the intermediate frequency signal and time of the fm continuous wave radar according to an embodiment of the invention.
Fig. 5 is a schematic diagram showing the relationship between the input signal and the output signal of the fm continuous wave radar target simulator according to an embodiment of the invention.
Fig. 6 is a schematic diagram of a fm continuous wave radar target simulator according to an embodiment of the invention.
Fig. 7 is a schematic structural diagram of an antenna plane and a feed network plane of a circularly polarized antenna according to an embodiment of the invention.
Fig. 8 is a schematic diagram showing a trace length relationship of a feeding network of a circularly polarized antenna according to an embodiment of the present invention.
Fig. 9 is a schematic diagram of a fm continuous wave radar target simulator according to an embodiment of the invention.
FIG. 10 is a schematic diagram of an application test environment of a microwave radar sensing test system according to an embodiment of the invention.
Fig. 11 shows a schematic view of a radar sensor installation in an embodiment of the present invention.
Fig. 12 is a schematic view illustrating polarization decomposition of a circularly polarized electromagnetic wave according to an embodiment of the present invention.
Fig. 13 is a schematic diagram showing an axial ratio index of a circular polarized antenna at each main direction angle according to an embodiment of the invention.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
In the following description, reference is made to the accompanying drawings, which illustrate several embodiments of the invention. It is to be understood that other embodiments may be utilized and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present invention. The following detailed description is not to be taken in a limiting sense, and the scope of embodiments of the present invention is defined only by the claims of the issued patent. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Spatially relative terms, such as "upper," "lower," "left," "right," "lower," "below," "lower," "above," "upper," and the like, may be used herein to facilitate a description of one element or feature as illustrated in the figures relative to another element or feature.
Throughout the specification, when a portion is said to be "connected" to another portion, this includes not only the case of "direct connection" but also the case of "indirect connection" with other elements interposed therebetween. In addition, when a certain component is said to be "included" in a certain section, unless otherwise stated, other components are not excluded, but it is meant that other components may be included.
The first, second, and third terms are used herein to describe various portions, components, regions, layers and/or sections, but are not limited thereto. These terms are only used to distinguish one portion, component, region, layer or section from another portion, component, region, layer or section. Thus, a first portion, component, region, layer or section discussed below could be termed a second portion, component, region, layer or section without departing from the scope of the present invention.
Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," and/or "including" specify the presence of stated features, operations, elements, components, items, categories, and/or groups, but do not preclude the presence, presence or addition of one or more other features, operations, elements, components, items, categories, and/or groups. The terms "or" and/or "as used herein are to be construed as inclusive, or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a, A is as follows; b, a step of preparing a composite material; c, performing operation; a and B; a and C; b and C; A. b and C). An exception to this definition will occur only when a combination of elements, functions or operations are in some way inherently mutually exclusive.
According to the frequency modulation continuous wave radar principle, after receiving a microwave radar signal, a circuit integrated on a circuit board of the simulator generates and returns an echo signal containing detection target information to the microwave radar, and whether the function of the radar in an actual scene can meet the use requirement is deduced by detecting the processing capacity of the radar on the echo signal. The method and the device realize quantification, adjustability and repeatability of the target signal which is difficult to quantify, inflexible and poor in repeatability in the prior art, can accurately set the distance information, the speed information and the amplitude information of the radar echo signal simulation target, and enable the microwave radar test to be more economical and flexible and better in scene repeatability and controllability.
The applicable radar of the invention is a frequency modulation continuous wave radar, the frequency sent by a common Doppler radar is fixed, the frequency sent by the frequency modulation continuous wave radar is linearly changed along with time, and the relation of the frequency modulation continuous wave radar sending frequency along with time is shown in figure 1; where B is the frequency modulation bandwidth range, T is the frequency modulation period, a frequency modulation period is also commonly referred to as a chirp, and fc is the starting frequency of the transmitted signal.
The embodiments of the present invention will be described in detail below with reference to the attached drawings so that those skilled in the art to which the present invention pertains can easily implement the present invention. This invention may be embodied in many different forms and is not limited to the embodiments described herein.
Fig. 2 shows a schematic structural diagram of a frequency modulated continuous wave radar target simulator in an embodiment of the invention.
The frequency modulation continuous wave radar target simulator is used for simulating the detection target distance, the target speed and the target amplitude of the detection target.
The frequency modulation continuous wave radar target simulator comprises: the signal receiving module 1, the low noise amplifier 2, the first attenuator 3, the signal converting and phase shifting module 4, the first mixer 5, the second mixer 6, the processing module 7, the frequency synthesizer 8, the combiner 9, the second attenuator 10, the power amplifier 11 and the signal transmitting module 12 are integrated on the circuit board of the simulator.
The signal receiving module 1, the low noise amplifier 2, the first attenuator 3 and the signal conversion and phase shift module 4 are sequentially connected in series; specifically, the signal receiving module 1 is connected with the low noise amplifier 2, the low noise amplifier 2 is connected with the first attenuator 3, and the first attenuator 3 is connected with the signal conversion and phase shift module 4. The first mixer 5 and the second mixer 6 are connected in parallel and are respectively connected with the signal conversion and phase shift module 4, the frequency synthesizer 8 and the combiner 9; the processing module 7 is connected with the frequency synthesizer 8; the combiner 9, the second attenuator 10, the power amplifier 11 and the signal transmitting module 12 are sequentially connected in series; specifically, the combiner 9 is connected to the second attenuator 10, the second attenuator 10 is connected to the power amplifier 11, and the power amplifier 11 is connected to the signal transmitting module 12.
The signal receiving module 1 receives an electromagnetic wave signal sent by a radar sensor, then carries out signal amplification through the low noise amplifier 2, and then carries out electromagnetic wave amplitude adjustment on the electromagnetic wave signal through the first attenuator 3; the signal conversion and phase shift module 4 converts the regulated signal from single-ended signal to differential signal, and outputs a pair of orthogonal radio frequency signals and transmits the signals to the first mixer 5 and the second mixer 6; meanwhile, the processing module 7 converts the digital signal conforming to the analog target feature generated based on the analog target parameter related to the analog target into a pair of baseband analog quadrature signals conforming to the analog target feature by the frequency synthesizer 8 according to the digital signal conforming to the analog target feature; the first mixer 5 and the second mixer 6 respectively mix the baseband analog quadrature signal with the radio frequency signal output by the signal conversion and phase shift module 4, and then add the signals mixed by the first mixer 5 and the second mixer 6 through the combiner 9; the added signals sequentially pass through a second attenuator 10 and a power amplifier 11 for signal amplification and electromagnetic wave amplitude adjustment, and an analog target signal which accords with the detection target distance, target speed and target amplitude of the detection target is returned to the frequency modulation continuous wave radar sensor by a signal transmitting module 12.
The processing module 7 can be a microprocessor MCU, and the scheme mainly utilizes the signal mixing modulation principle to realize the simulation of the detection target of the frequency modulation continuous wave radar, does not need to use a very high-end microprocessor, and reduces the difficulty and cost of software development.
Preferably, the PCB size of the simulator circuit board is only 100 x 60mm, the space requirement on the use environment is low, and the high-integration and miniaturization design is realized.
In order to better describe the specific manner in which a frequency modulated continuous wave radar target simulator simulates a detected target, the following specific embodiments will be described.
In one embodiment, the method for simulating the detected object distance of the detected object includes:
the frequency synthesizer 8 receives a digital signal generated from the processing module 7 based on an analog target parameter related to a detection target distance of a detection target, and changes a frequency parameter of the frequency synthesizer 8 and converts a baseband analog quadrature signal pair conforming to a target frequency based on the frequency parameter. The baseband analog quadrature signals are mixed with the quadrature radio frequency signals output by the signal conversion and phase shift module 4 through the first mixer 5 and the second mixer 6 respectively, and then the signals mixed by the first mixer 5 and the second mixer 6 are added through the combiner 9, so that the signals after signal addition are subjected to signal amplification and electromagnetic wave amplitude adjustment through the second attenuator 10 and the power amplifier 11 in sequence to generate analog target signals corresponding to detection target distances.
The frequency parameter is used for obtaining the corresponding detection target distance by the frequency modulation continuous wave radar sensor based on the intermediate frequency beat signal frequency of the analog target signal.
Namely, in this embodiment, the frequency parameter of the frequency synthesizer 8 is changed to convert the baseband analog orthogonal signal pair according with the target frequency, so as to obtain an analog target signal with the intermediate frequency beat signal frequency according with the detection target distance, so that the frequency modulation continuous wave radar sensor obtains the corresponding detection target distance.
Further, the principle of simulating the detected target distance of the detected target is as follows:
the principle of the frequency modulation continuous wave radar target simulation is that a signal sent by the frequency modulation continuous wave radar is reflected back and amplified by the radar after encountering a detected target, as shown in fig. 3, the transmitted signal and the received signal are identical in waveform, but differ by a delay tau, which is the time that the radar sends out electromagnetic waves to the detected target and then reflected back to the radar by the detected target.
Namely:
wherein R is the distance between the frequency modulation continuous wave radar and the detection target, and c is the propagation speed of the electromagnetic wave in vacuum. From this, it can be seen that knowing the delay τ, the detection target distance R can be calculated according to the above formula.
As shown in FIG. 4, after receiving and mixing the frequency modulated continuous wave radar receiving signal and the transmitting signal, two frequency signals fb and B-fb are obtained, wherein generally B is far greater than fb, and a low pass filter is used to filter out the B-fb signal, and only the fb signal remains. Then the proportional relation is utilized to obtain the delay tau, namely
Wherein T is the frequency modulation period of the frequency modulation continuous wave radar, B is the frequency modulation bandwidth of the frequency modulation continuous wave radar, and fb is the frequency of the intermediate frequency beat signal.
By combining the formula (1) and the formula (2), the relation between the frequency modulation continuous wave radar and the detection target distance R and the intermediate frequency beat signal frequency fb can be calculated, namely:
wherein T is the frequency modulation period of the frequency modulation continuous wave radar, c is the propagation speed of electromagnetic waves in vacuum, B is the frequency modulation bandwidth of the frequency modulation continuous wave radar, and fb is the frequency of the intermediate frequency beat signal of the frequency modulation continuous wave radar.
The frequency of the FM continuous wave radar transmission is changed with time modulation, but the frequency at a certain time point is fixed, and the radar signal at the time point is input into the FM continuous wave radar target simulator RF in Can be simply defined asIn order to simplify calculation, phase shift, delay and gain change in the air and circuit transmission process are not considered, and two paths of quadrature signals are obtained after the low noise amplifier, the first attenuator, the signal conversion and phase shift module >Andrespectively enter a first mixer and a second mixer. The baseband signal 1 and the baseband signal 2 sent by the frequency synthesizer are quadrature signals with the same frequency and amplitude and 90 degrees phase difference, wherein the baseband signal 1 can be simply defined asThe baseband signal 2 can be defined simply as +.>
The mixed output signal of the first mixer results in:
the mixed output signal of the second mixer results in:
the output signal results of the first mixer and the second mixer are synthesized and added by a combiner to obtain an output signal result RF out The method comprises the following steps:
from the above formula, the frequency modulation continuous wave radar target simulator inputs the radar signal RF at a certain time point in Frequency omega r Output signal RF of/2 pi out Frequency is (omega) r -ω b ) Output signal RF of/2 pi frequency modulation continuous wave radar target simulator out Compared with the input signal RF in The frequency offset is (-omega) b ) 2 pi. Other time points, frequency modulation continuous wave radar can be obtained by the same methodThe input signal frequency of the target simulator is different, but the frequency offset of the output signal compared with the input signal is equal to (-omega) b ) With frequency fb of intermediate frequency beat signal of analog FM continuous wave radar of (omega) b ) And/2 pi as shown in FIG. 5. Changing, by the processing module, a parameter ω of the frequency synthesizer based on a digital signal generated by the processing module based on an analog target parameter related to a detected target distance of the detected target b By generating the baseband signal 1 and the baseband signal 2 with different frequencies, the target analog signals with different beat frequencies fb can be simulated, i.e. by modifying the parameter omega b The echo signals of the frequency modulation continuous wave radar detection targets at different distances can be simulated, and corresponding detection target distance information can be calculated according to the formula (3).
In one embodiment, the method for simulating the target speed of the detected target includes:
changing, by the frequency synthesizer 8, phase parameters of the frequency synthesizer 8 according to digital signals received from the processing module 7 generated based on analog target parameters related to a target speed of a detection target, and converting the phase parameters into a baseband analog quadrature signal pair conforming to a target phase; the baseband analog quadrature signals are respectively mixed with quadrature radio frequency signals output by the signal conversion and phase shift module 4 through the first mixer 5 and the second mixer 6, and then the signals mixed by the first mixer 5 and the second mixer 6 are added through the combiner 9, so that the signals after signal addition are subjected to signal amplification and electromagnetic wave amplitude adjustment through the second attenuator 10 and the power amplifier 11 in sequence to generate analog target signals corresponding to target speeds;
And the phase of the intermediate frequency beat signal frequency of the analog target signal is related to the phase parameter, so that the frequency modulation continuous wave radar sensor can obtain the target speed through the phase difference between the received intermediate frequency beat signal frequencies of the analog target signal in adjacent frequency modulation periods.
Namely, the present embodiment converts the baseband analog quadrature signal pair conforming to the target phase by changing the phase parameter of the frequency synthesizer 8, so as to obtain an analog target signal conforming to the intermediate frequency beat signal frequency of the target phase, so that the fm continuous wave radar sensor obtains a corresponding detection target distance.
Further, the principle of simulating the target speed of the detected target is as follows:
the frequency fb of the beat detected between chirp of the fm continuous wave radar will have a trend of a certain frequency shift due to the change of the detection distance generated by the motion of the detection target, generally, the distance change generated by the motion of the detection target is very tiny due to the very short time between chirp, the corresponding fb frequency change is very tiny and indistinguishable, but the phase change of fb is very obvious, so the motion speed of the target can be detected through the change of fb phase.
Defining the motion speed of the detection target as v, and the chirp modulation period as T, wherein the distance between the two chirp detection targets is Δd
Δd＝v·T ； (8)
Defining the phase change of the beat frequency fb between two chirps asFrom phase change and wavelength relationship
Where λ=c/fc, c is the propagation speed of light in vacuum, and fc is the starting frequency of the fm continuous wave radar transmission.
From formulas (8) and (9), the sum v can be obtainedThe relation of (2) is that
From equation (10), simulate a differentI.e. the different speed information of the detected target can be simulatedv。/>Indicating that the direction of movement of the detection target is far from the radar direction, +.>Indicating that the direction of motion of the detection target is close to the radar direction.
From equation (7),the analog signal of the detection target corresponding to the signal isEcho analog signal +.>Amplified and received by frequency modulation continuous wave radar and local oscillation signal +.>After mixing, the intermediate frequency beat frequency fb is obtained
Filtering out the high frequency component by a low pass filter
From equation (13), the FM continuous wave radar receives the phase of the IF beat frequency corresponding to the echo signal generated by the simulatorOnly the phase of the baseband signal and the phase of the fm continuous wave radar signal. Generating the phase of the baseband signal by controlling the frequency synthesizer >Let the phase difference of the beat frequency fb between chirp +.>And (3) satisfying the formula (10), namely simulating the speed information v corresponding to the detection target.
In one embodiment, RCS (radar cross-sectional area) is an imaginary area defined as the ratio of the reverse echo power to the incident injection power density of a radar detection target in a given direction, the parameter being described in terms of unit area. The larger the RCS value, the stronger the backscatter echo capability, and the greater the echo power received by the radar.
The manner of simulating the target amplitude RCS of the detection target includes:
the amplitude of the signal is adjusted by setting one or more of the parameters of the low noise amplifier 2, the first attenuator 3, the second attenuator 10, the frequency synthesizer 8 and the power amplifier 11, so as to generate an analog target signal of the output power which meets the target amplitude.
The output power of the frequency modulation continuous wave radar target simulator can be controlled by utilizing various combinations of adjusting parameters of the low noise amplifier 2, the first attenuator 3, the second attenuator 10, the power amplifier 11, the frequency synthesizer 8, controlling the amplitude of an intermediate frequency signal, and the like, so that the purpose of simulating the target amplitude is achieved, the purpose of simulating the detection target amplitude information (RCS) is achieved, and the use scene of the detection target simulation with various different input powers and different output powers can be flexibly met. The analog target amplitude can also be realized by adjusting the analog target parameter of the processing module 7, and further adjusting and controlling the amplitude of the intermediate frequency signal sent by the frequency synthesizer 8.
In one embodiment, as shown in fig. 6, the signal receiving module 1 includes: a built-in circularly polarized receiving antenna 101, a first radio frequency switch 102 and a receiving radio frequency head 103; the application can receive electromagnetic wave signals emitted by the radar by connecting an internal circularly polarized receiving antenna 101 or a receiving radio frequency head 103 and an external receiving antenna;
wherein, the built-in circularly polarized receiving antenna 101 can be used for receiving electromagnetic wave signals with any polarization direction;
the receiving rf head 103 is configured to be externally connected to a receiving antenna, so as to receive an electromagnetic wave signal through the receiving antenna; the receiving antenna is set according to the requirement.
The radio frequency switch 102 is connected to the built-in circularly polarized receiving antenna 101 and the transmitting radio frequency head 103, and is used for controlling the receiving antenna externally connected to the built-in circularly polarized receiving antenna 101 or the receiving radio frequency head 103 to receive electromagnetic wave signals, so as to input the electromagnetic wave signals to the low noise amplifier.
In one embodiment, as shown in fig. 6, the signal transmitting module 12 includes: a built-in circularly polarized transmitting antenna 121, a second radio frequency switch 122 and a transmitting radio frequency head 123; according to the application, the simulation target signal can be transmitted to the radar sensor by connecting the built-in circularly polarized transmitting antenna 121 or the transmitting radio frequency head 123 with an external transmitting antenna;
Wherein the built-in circularly polarized transmitting antenna 121 is used for transmitting a simulated target signal in the form of circularly polarized electromagnetic waves;
the transmitting rf head 123 is configured to be externally connected to a transmitting antenna, so as to transmit the analog target signal through the transmitting antenna; the transmitting antenna is set according to the requirements.
The radio frequency switch 122 is connected to the built-in circularly polarized transmitting antenna 121 and the transmitting radio frequency head 123, and is used for controlling the transmitting antenna externally connected with the built-in circularly polarized transmitting antenna 121 or the transmitting radio frequency head 123 to transmit the analog target signal.
In one embodiment, the problem of large amplitude differences in analog signals due to different polarization directions of the antenna of the radar product is prevented.
And adopting the built-in circular polarization receiving antenna and the built-in circular polarization transmitting antenna to receive and transmit signals.
As shown in fig. 7a, the built-in circular polarized receiving antenna and the built-in circular polarized transmitting antenna are respectively embedded in the front surface (antenna surface) of the simulator circuit board, and as shown in fig. 7b, a feed network which is matched with the built-in circular polarized receiving antenna and the built-in circular polarized transmitting antenna is respectively arranged on the back surface (feed network surface) of the simulator circuit board; the built-in circular polarization receiving antenna and the built-in circular polarization transmitting antenna are respectively provided with a first feeding point and a second feeding point, and the first feeding point and the second feeding point connect the antennas with the corresponding feeding network in a metal via way; the first feeding point and the second feeding point are equal in distance from the geometric center of the corresponding antenna, and connecting lines of the two feeding points to the geometric center of the corresponding antenna are orthogonal to each other;
The built-in circularly polarized receiving antenna is combined with a corresponding feed network to acquire a received electromagnetic wave signal sent by the frequency modulation continuous wave radar sensor; and the built-in circularly polarized transmitting antenna is combined with a corresponding feed network to send the generated simulated target signal in the form of transmitting circularly polarized electromagnetic waves to the frequency modulation continuous wave radar sensor.
Each feed network is provided with a power divider and a resistor; one end of the power divider is connected with a first feeding point and a second feeding point of the corresponding antenna, and the other end of the power divider is connected with the low-noise amplifier or the power amplifier arranged on the simulator circuit board; the resistor bridges the first specific position and the second specific position which are respectively arranged on the transmission sections from the first feeding point and the second feeding point to the power divider, and the resistance value of the resistor is twice the impedance value of the transmission microstrip line.
If the feed network is arranged corresponding to the built-in circular polarization receiving antenna, one end of the feed network is connected with a first feed point and a second feed point of the built-in circular polarization receiving antenna; the other end is connected with a low noise amplifier after being combined by a power divider. If the feed network is arranged corresponding to the built-in circular polarization transmitting antenna, one end of the feed network is connected with a first feed point and a second feed point of the built-in circular polarization transmitting antenna; the other end is connected with a power amplifier after being combined through a power divider; preferably, the power divider is a one-to-one second-power divider.
Preferably, the length of each section of transmission line of the feed network has special requirements. Is thatThe accurate circularly polarized electromagnetic wave is synthesized, as shown in FIG. 8, the transmission section length L between the first specific position A and the first feeding point 1 A1 And a transmission segment length L between the second specific position B and the second feeding point 2 B2 The first length relation is satisfied; and corresponds to the transmission section length L between the first specific position A and the power divider D DA And a transmission section length L between the second specific position B and the power divider D DB The second length relation is met to ensure that the phase difference relation of the two feed points is 90 degrees accurately, the power is equal, and the accurate circularly polarized electromagnetic wave is synthesized. A transmission section length L corresponding to the first specific position A to the second specific position B through a resistor R ARB And a transmission section length L corresponding to the first specific position A passing through the power divider D and then reaching the second specific position B ADB The third length relationship is satisfied.
Wherein the first length relationship comprises:
and wherein lambda is the wavelength of electromagnetic wave in air at the radar working frequency, epsilon is the dielectric constant of the circuit board, and N is a natural number.
And the second length relation is corresponding to the transmission section length L between the first specific position A and the power divider D DA And a transmission section length L between the second specific position B and the power divider D DB Equal.
At this time, the phase difference between the two feeding points is 90 °, the power is equal, the electromagnetic waves excited respectively are a pair of linear polarized waves orthogonal to each other, and the synthesized wave form is a circular polarized wave.
The third length relationship includes:
and wherein L ARB For the first specific position A via a resistor RLength of transmission segment to second specific position B, L ADB And for the length of a transmission section from the first specific position A to the second specific position B through the power divider D, lambda is the wavelength of electromagnetic waves in air at the radar working frequency, epsilon is the dielectric constant of a circuit board, and N is a natural number.
The feeding circuit in one embodiment may additionally employ a bridge, balun, phase shifter, etc.; the implementation of the built-in circular polarization receiving and transmitting antenna can additionally adopt other schemes such as antenna corner cutting, slotting and the like.
In one embodiment, as shown in fig. 6, the signal conversion and phase shift module includes:
a signal conversion section 41 for converting the adjusted signal from a single-ended signal to a differential signal;
and a phase shifting unit 42 connected to the signal converting unit, for shifting the phase of the converted differential signal and outputting a pair of orthogonal radio frequency signals.
The signal conversion unit 41 may be a balun, or a device such as a power divider or a coupler may be used. The phase shifting unit 42 may be a phase shifter or a microstrip line phase shifting device. And the signal conversion part 41 and the phase shift part 42 of the signal conversion and phase shift module may also be implemented using a bridge.
In one embodiment, the frequency modulation continuous wave radar target simulator is connected with an upper computer control end; further, as shown in fig. 2, the processing module 7 is connected to the upper computer control terminal 13, and is configured to set the simulation target parameter based on a control instruction of the upper computer control terminal 13, and generate a digital signal according with the simulation target feature.
The upper computer control end can modify the analog target parameters of the processing module 7 so as to modify the parameters of the frequency synthesizer, and adjust the frequency, amplitude and phase relation of the intermediate frequency signal 1 and the intermediate frequency signal 2, so as to adjust the detection target distance, target speed, target amplitude and whether the target is close or far.
In an embodiment, the fm continuous wave radar target simulator is connected to the upper computer control end through a USB interface, the upper computer control end identifies a serial port of the fm continuous wave radar target simulator through the connected USB interface, and can modify internal parameters of the processing module through the serial port to adjust simulation target characteristics, the parameter modification takes effect in real time and can be powered down and stored as required, and if the simulation target parameters are not required to be modified next time, the upper computer can not be used to modify the target parameters. In the implementation process of the scheme, the low-power consumption design is considered, the USB of the control end of the upper computer can be used for supplying power, and the cost of a direct-current power supply is not required to be increased additionally.
In order to better illustrate the frequency modulated continuous wave radar target simulator, the present invention provides the following specific embodiments.
Example 1: a frequency modulated continuous wave radar target simulator. Fig. 9 is a schematic structural diagram of a fm continuous wave radar target simulator according to an embodiment.
The frequency modulation continuous wave radar target simulator comprises: the device comprises a receiving antenna, a radio frequency switch, a receiving radio frequency head, a transmitting antenna, a transmitting radio frequency head, a low noise amplifier, an attenuator, a balun, a phase shifter, a first mixer, a second mixer, a microprocessor, a frequency synthesizer, a combiner, a power amplifier, an upper computer control end and a self-grinding set software tool;
the receiving antenna or the receiving radio frequency head is added with an external receiving antenna to receive electromagnetic wave signals emitted by a radar, the signals are amplified by a low noise amplifier, then the amplitude of the electromagnetic wave signals is adjusted by a radio frequency attenuator, then single-ended signals are converted into differential signals by a balun, and a pair of orthogonal radio frequency signals are output by a phase shifter; meanwhile, the microprocessor outputs a digital signal which accords with the analog detection target information according to preset parameters, the digital signal is converted into a pair of baseband analog orthogonal signals which accord with the analog detection target characteristics through the frequency synthesizer, the pair of signals are mixed with the orthogonal radio frequency signals through the mixers 1 and 2 respectively, then the two paths of signals are added through the combiner, the output signal is attenuated or amplified appropriately through the attenuator and the power amplifier to meet the analog detection target amplitude requirement, and then the analog target signal is returned to the microwave radar through the transmitting antenna or the transmitting radio frequency head and the external transmitting antenna. If the simulation detection target information parameters need to be modified, an upper computer end tool of the self-grinding matching sleeve can be used for modifying the internal parameters of the microprocessor through the serial port to adjust the simulation detection target information parameters, the parameter modification takes effect in real time and can be powered down and stored according to the needs, and if the simulation detection target information parameters do not need to be modified next time, the upper computer can not be used.
The built-in receiving and transmitting circularly polarized antenna adopts an on-board microstrip antenna with a 90-degree phase-shifting power divider and a double-hole back feed, the scheme is low in cost, easy to realize, high in consistency and convenient to use, and the problem that simulation targets are large due to antenna polarization direction differences in the research and development and testing processes of radar products is solved.
Fig. 10 shows a schematic view of an application test environment of a microwave radar sensing test system according to an embodiment of the invention.
The frequency modulation continuous wave radar target simulator is applied to target simulation of a single radar sensor product, such as radar sensor product signal processing capability test analysis in the research and development process and the like;
the system is in an external environment built by wave absorbing materials, comprising:
a frequency modulated continuous wave radar sensor 61 mounted on a tooling plane of the fixed tooling 01;
a frequency modulated continuous wave radar target simulator 62 installed in a normal direction along the tooling plane as a target simulator for the test system; it should be noted that, the fm continuous wave radar target simulator 62 may implement all the functions of the fm continuous wave radar target simulator in the above embodiments, which will not be described in detail. In addition, the frequency modulation continuous wave radar target simulator 62 is also connected with the control end of the upper computer through a USB interface by using a USB power supply serial communication line.
It should be noted that, as shown in fig. 11, the tooling design for testing the fm continuous wave radar sensor 61 is mostly in a manner of spreading along a plane, and the target simulator is disposed in a direction normal to the plane, so that the difference between the detection results is small.
Wherein the fm continuous wave radar target simulator 62 simulates a detected target distance, target speed and target amplitude of the detected target based on the received electromagnetic wave emitted by the fm continuous wave radar sensor 61 and the simulated target parameters related to the detected target, and returns a simulated target signal conforming to the detected target distance, target speed and target amplitude of the detected target to the corresponding radar sensor for the radar sensor to obtain the detected target distance, target speed and target amplitude of the detected target based on the received simulated target signal.
In one embodiment, as shown in FIG. 10, the FM continuous wave radar target simulator 62 is mounted in a direction normal to the tooling plane at a distance d from the tooling plane. D satisfies a fixed distance relationship;
wherein the fixed distance relationship comprises:
and D is the diagonal length of the fixture for fixing the frequency modulation continuous wave radar sensor, and lambda is the wavelength in the air corresponding to the electromagnetic wave under the radar working frequency.
According to the principle of a circularly polarized antenna, a circularly polarized signal can be equivalently decomposed into any two signals which are orthogonally polarized, have equal amplitude and have 90-degree phase difference, so that a circularly polarized antenna used by the frequency modulation continuous wave radar target simulator can be always decomposed into a signal with the same polarization direction as that of the antenna of the microwave radar sensor and a signal with the same polarization direction as that of the antenna of the microwave radar sensor, regardless of the arrangement of the polarization directions of the antenna of the microwave radar sensor to be detected, as shown in fig. 12. Therefore, the frequency modulation continuous wave radar target simulator of the scheme is used regardless of the antenna polarization direction of the microwave radar sensor, and microwave signals with the same amplitude can be received and transmitted between the frequency modulation continuous wave radar target simulator and the detected microwave radar sensor, so that the test result cannot be interfered because the antenna polarization direction of the microwave radar sensor is inconsistent with the antenna polarization direction of the circular polarization antenna test equipment.
In the general circular polarization design, the ratio of the magnitudes of two linear polarizations after the circular polarization is split into two orthogonal linear polarizations is called an axial ratio. When the axial ratio is less than or equal to 3dB, the circular polarization design requirement is considered to be met. And fig. 13 shows the axial ratio index of the target simulator in the present solution at each main direction angle, and it can be seen that the axial ratio index in the present solution is basically kept below 1dB, and the circular polarization strictness is higher than the general standard.
Thus, compared with the prior art, the invention has the following advantages:
1. based on the technical scheme of the invention, the microwave radar test scheme is more economical and flexible, has better scene repeatability and controllability, and is changed from the qualitative measurement of the previous random target scene to the quantitative measurement of the fixed target information. The method can be applied to test analysis and the like of the signal processing capability of the radar sensor product in the research and development process, and the radar sensor product does not need to be tested in a real scene, so that the research and development test cost is reduced, and the research and development test efficiency is improved; the method can also be applied to the production test of radar sensor products, and the consistency and reliability of the product performance test result are improved. Can play an important role in the research and development of the radar, the problem analysis, the production process and the like.
2. The technical scheme provided by the invention comprises a design of the built-in circularly polarized antenna, so that the harsh requirement on the polarization direction of the antenna of the radar product is reduced in the use process, and the problem of large performance difference of the simulation target caused by improper placement of the polarization direction of the antenna of the radar product is solved.
3. Based on the technical scheme of the invention, the high-integration and miniaturized design is adopted, the portable and portable shielding device is convenient to carry and install, no obstacle is caused when the portable and miniaturized shielding device is used in a narrow environment, the relative size of the corresponding shielding environment can be relatively small, and the space and cost of the shielding environment are saved.
4. Based on the technical scheme of the invention, the USB interface of the upper computer can meet the power supply requirement in consideration of low-power consumption design, and the USB interface of the upper computer does not need to occupy the direct current power supply additionally, thereby being convenient to use and saving the cost of purchasing the direct current power supply.
In summary, according to the frequency modulation continuous wave radar target simulator and the microwave radar sensing test system, according to the frequency modulation continuous wave radar principle, after receiving a microwave radar signal, the circuit integrated on the simulator circuit board generates and returns an echo signal containing detection target information to the microwave radar, and whether the function of the radar in an actual scene can meet the use requirement is deduced by detecting the processing capability of the radar on the echo signal. The method and the device realize quantification, adjustability and repeatability of the target signal which is difficult to quantify, inflexible and poor in repeatability in the prior art, can accurately set the distance information, the speed information and the amplitude information of the radar echo signal simulation target, and enable the microwave radar test to be more economical and flexible and better in scene repeatability and controllability.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. It is therefore intended that all equivalent modifications and changes made by those skilled in the art without departing from the spirit and technical spirit of the present invention shall be covered by the appended claims.
Claims (10)
1. A frequency modulated continuous wave radar target simulator for simulating a detected target distance, a target speed and a target amplitude of a detected target, the target simulator comprising:
the signal receiving module, the low noise amplifier, the first attenuator, the signal conversion and phase shift module, the first mixer, the second mixer, the processing module, the frequency synthesizer, the combiner, the second attenuator, the power amplifier and the signal transmitting module are integrated on the circuit board of the simulator;
the signal receiving module, the low noise amplifier, the first attenuator and the signal conversion and phase shift module are sequentially connected in series; the first mixer and the second mixer are respectively connected with the signal conversion and phase shift module, the frequency synthesizer and the combiner; the processing module is connected with the frequency synthesizer; the combiner, the second attenuator, the power amplifier and the signal transmitting module are sequentially connected in series;
the signal receiving module receives an electromagnetic wave signal sent by the frequency modulation continuous wave radar sensor, and then the signal receiving module sequentially amplifies the electromagnetic wave signal and adjusts the amplitude of the electromagnetic wave through the low noise amplifier and the first attenuator; the signal conversion and phase shift module converts the regulated signal from a single-ended signal to a differential signal and outputs a pair of orthogonal radio frequency signals; converting, by the frequency synthesizer, a digital signal conforming to an analog target feature generated by the processing module based on an analog target parameter associated with the detection target into a pair of baseband analog quadrature signals conforming to the analog target feature; the first mixer and the second mixer respectively mix the baseband analog quadrature signal with the quadrature radio frequency signal output by the signal conversion and phase shift module, and then add the signals mixed by the first mixer and the second mixer through the combiner; the added signals sequentially pass through a second attenuator and a power amplifier to amplify the signals and adjust the amplitude of electromagnetic waves, and the signal transmitting module returns the analog target signals which accord with the detection target distance, the target speed and the target amplitude of the detection target to the frequency modulation continuous wave radar sensor.
2. The fm continuous wave radar target simulator of claim 1, wherein simulating the detected target distance of the detected target comprises:
changing frequency parameters of a frequency synthesizer according to a received digital signal generated by the frequency synthesizer based on analog target parameters related to the detection target distance of a detection target through the processing module, converting the digital signal into a baseband analog orthogonal signal pair conforming to the target frequency, respectively mixing the baseband analog orthogonal signal pair with the orthogonal radio frequency signals output by the signal conversion and phase shift module through the first mixer and the second mixer, and adding the mixed signals of the first mixer and the second mixer through the combiner so as to enable the added signals to sequentially pass through a second attenuator, a power amplifier to be amplified and an electromagnetic wave amplitude adjustment to generate analog target signals conforming to the detection target distance;
the frequency parameter is used for obtaining the corresponding detection target distance by the frequency modulation continuous wave radar sensor based on the intermediate frequency beat signal frequency of the analog target signal.
3. The fm continuous wave radar target simulator of claim 1, wherein simulating the target speed of the probe target comprises:
changing phase parameters of a frequency synthesizer according to a received digital signal generated by the frequency synthesizer based on an analog target parameter related to a target speed of a detection target through the processing module, converting the digital signal into a baseband analog quadrature signal pair conforming to a target phase, respectively mixing the baseband analog quadrature signal pair with a radio frequency signal output by the signal conversion and phase shift module through the first mixer and the second mixer, adding the mixed signals of the first mixer and the second mixer through the combiner, and sequentially carrying out signal amplification and electromagnetic wave amplitude adjustment on the added signals through the second attenuator and the power amplifier to generate an analog target signal conforming to the target speed;
and the phase of the intermediate frequency beat signal frequency of the analog target signal is related to the phase parameter, so that the frequency modulation continuous wave radar sensor can obtain the target speed through the phase difference between the received intermediate frequency beat signal frequencies of the analog target signal in adjacent frequency modulation periods.
4. A fm continuous wave radar target simulator as claimed in claim 1, wherein the means for simulating the target amplitude of the detected target comprises:
and adjusting the amplitude of the signal by setting one or more of parameters of a low noise amplifier, a first attenuator, a second attenuator, a frequency synthesizer and a power amplifier, and generating an analog target signal of the output power which accords with the target amplitude.
5. The fm continuous wave radar target simulator of claim 1, wherein the signal receiving module comprises: a circular polarization receiving antenna, a first radio frequency switch and a receiving radio frequency head are arranged in the antenna;
the built-in circularly polarized receiving antenna is used for receiving electromagnetic wave signals in any polarization direction;
the receiving radio frequency head is used for externally connecting a receiving antenna so as to receive electromagnetic wave signals through the receiving antenna;
the radio frequency switch is connected with the built-in circularly polarized antenna and the receiving radio frequency head and is used for controlling the built-in circularly polarized antenna or a receiving antenna externally connected with the receiving radio frequency head to correspondingly receive electromagnetic wave signals so as to input the electromagnetic wave signals to the low noise amplifier.
6. The frequency modulated continuous wave radar target simulator of claim 1, wherein the signal transmitting module comprises: a circular polarization transmitting antenna, a second radio frequency switch and a transmitting radio frequency head are arranged in the antenna;
the built-in circularly polarized transmitting antenna is used for transmitting a simulated target signal in the form of circularly polarized electromagnetic waves;
the transmitting radio frequency head is used for being externally connected with a transmitting antenna so as to transmit the analog target signal through the transmitting antenna;
the radio frequency switch is connected with the built-in circular polarization transmitting antenna and the transmitting radio frequency head and is used for controlling the transmitting antenna externally connected with the built-in circular polarization transmitting antenna or the transmitting radio frequency head to transmit the simulation target signal.
7. The frequency modulation continuous wave radar target simulator according to claim 5 or 6, wherein the built-in circular polarization receiving antenna and the built-in circular polarization transmitting antenna are respectively embedded in the front surface of the simulator circuit board, and a feed network matched with the built-in circular polarization receiving antenna and the built-in circular polarization transmitting antenna is respectively arranged on the back surface of the simulator circuit board; the built-in circular polarization receiving antenna and the built-in circular polarization transmitting antenna are respectively provided with a first feeding point and a second feeding point, and the first feeding point and the second feeding point connect the antennas with the corresponding feeding network in a metal via way; the first feeding point and the second feeding point are equal in distance from the geometric center of the corresponding antenna, and connecting lines of the two feeding points to the geometric center of the corresponding antenna are orthogonal to each other;
The built-in circularly polarized receiving antenna is combined with a corresponding feed network to receive electromagnetic wave signals sent by the frequency modulation continuous wave radar sensor; and the built-in circularly polarized transmitting antenna is combined with a corresponding feed network to send the generated simulated target signal in the form of transmitting circularly polarized electromagnetic waves to the frequency modulation continuous wave radar sensor.
8. The fm continuous wave radar target simulator of claim 1, wherein said signal conversion and phase shift module comprises:
a signal conversion section for converting the adjusted signal from a single-ended signal to a differential signal;
and the phase shifting component is connected with the signal conversion component and is used for shifting the phase of the converted differential signal and outputting a pair of orthogonal radio frequency signals.
9. The fm continuous wave radar target simulator of claim 1, wherein the processing module is configured to set the simulation target parameters based on a control command from a host computer control terminal connected to the fm continuous wave radar target simulator, and generate a digital signal according to a characteristic of the simulation target.
10. A microwave radar sensing test system, the system comprising:
The frequency modulation continuous wave radar sensor is arranged on a tool plane of the fixed tool;
a frequency modulated continuous wave radar target simulator as defined in any one of claims 1 to 9 mounted in a direction normal to the tool plane;
the frequency modulation continuous wave radar target simulator simulates the detection target distance, the target speed and the target amplitude of the detection target based on the received electromagnetic waves transmitted by the frequency modulation continuous wave radar sensor and the simulation target parameters related to the detection target, and returns the simulation target signals conforming to the detection target distance, the target speed and the target amplitude of the detection target to the corresponding frequency modulation continuous wave radar sensor so that the frequency modulation continuous wave radar can obtain the detection target distance, the target speed and the target amplitude of the detection target based on the received simulation target signals.
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